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[DIF]
+
"OFF"
Communication
From
≥1
failure, etc.
Figure
2.2.2.1.
DIF BLOCK
43C ON
1
If the distance protection is active only when communication failure in the GRL100, it is achieved
by the PLC function. See Appendix S.
Zone 1 tripping is provided with an additional phase selection element UVC and phase selection
logic to make sure the faulted phase is selected for the single-phase earth fault.
Figure 2.3.1.7 gives details of the phase selection logic in Figure 2.3.1.5. In case of single-phase
earth fault, the earth fault measuring zone 1 element Z1G with a certain phase and the phase
selection element UVC with the same phase operate together, and a single-phase tripping
command S-TRIP can be output to the phase.
Z1G - A
Z1G - B
Z1G - C
EFL
UVPWI-A
UVPWI-B
UVPWI-C
UVC - A
UVC - B
UVC - C
Z3G - A
Z3G - B
Z3G - C
Z1S-AB
Z1S-BC
Z1S-CA
Depending on the setting of the scheme switch [Z1CNT] or [ARC-M] which selects reclosing
mode, single-phase tripping may be converted to a three-phase tripping command. This is not
shown in the figure.
In case of multi-phase fault, the phase fault measuring zone 1 element Z1S and the two phases of
the UVC operate together, the Z1G trip is blocked and the three-phase tripping command M-TRIP
[Z1CNT]
Zone 1
+
Trip
Mode
Defalt setting
Control
789
DIF_OUT
2015
Logic
DIF_OUT_
SERV
Figure 2.3.1.6 Zone 1 Trip Mode Control Circuit
560
561
562
634
631
632
633
608
609
610
566
&
567
≥1
&
568
&
575
≥1
576
577
Figure 2.3.1.7 Phase Selection Logic for Zone 1 Protection
48
Defalt setting
785
Z1CNT_INST
786
Z1CNT_3PTP
787
Z1CNT_ARCBLK
788
Z1CNT_TPBLK
&
&
&
&
≥1
&
&
6 F 2 S 0 8 5 0
Z1 can trip instantaneously.
Z1_INST_TP
1936
Z1 performs three-phase trip.
Z1_3PTP
1968
Z1 performs final tripping
1847
Z1_ARC_BLOCK
for all faults.
Z1G_BLOCK
1888
Z1G trip is blocked.
Z1S_BLOCK
Z1S trip is blocked.
1904
A
B
S-TRIP
C
&
M-TRIP
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